More than 100 cigarette additives have pharmacological actions that camouflage the odor of cigarette tobacco smoke and enhance or maintain nicotine delivery, according to findings by scientists at the University of California, Los Angeles, who investigated tobacco industry documents and other sources (Rabinoff MD et al. Am J Public Health. doi:10.2105/AJPH.2005 .078014 [published online ahead of print July 31, 2007]).